Hi,
I'm trying to make a tunnel with ssh, I have 3 computers.
1) pc_ubuntu_desktop with vnc server
2) pc_ubuntu_server with ssh server
3) pc_windows with putty and vncviewer instllati
I want to create a tunnel from a pc_windows pc_ubuntu_desktop pc_ubuntu_server via ssh.

pc_windows to run the following command:
putty -L 5900:pc_ubuntu_desktop:5900 user@pc_ubuntu_server
Password: Enter password
connection made

then pc_windows always do:
> Vncviewer 127.0.0.1:5900

A screen comes up that says:
-------------------------------
Connection failed - End of stream

Possible causes:
-Another user is already listening on this ID
-Bad connection
-------------------------------
After making the tunnel and I can ping pc_ubuntu_desktop pc_ubuntu_server.